So I've owned the bike for a few weeks now and only recently have I started to put some miles on it. My question is what is a safe rpm to ride the grom in 4th gear? I know the redline starts at 8200rpm so I have been cautious. I have only been keeping the rpm at around 5500-5800 at 45mph. I wish to go faster but also will like to keep it at a safe rpm. Any insight will be helpful.